So I have always shipped using paper (and occasionally packing peanuts) to cushion the box. I recently heard a suggestion of pillow stuffing (the polyester or nylon kind (can't remember it's actual material)) being used for cold months because it supposedly holds heat better. Never heard this before, so was wondering if it is worth implementing... Any body have any thoughts, concerns, or experience with this?

If no health concerns, I'm almost tempted to take identical boxes and test the stuff side by side to paper to measure how well, if at all, it works as it makes some sense in how it would trap some warmer air better than paper or peanuts.... but not sure that is even worth my time and costs of supplies. Thoughts?